Concentrator-table.



Nn. 738,493. PATENTED SEPT. 8, 1903.

R. T. SCHRAUBSTADTER. CONCENTRATOR TABLEl APPLICATION FILED JULY 5.1901.

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immuun /ZJMJ PATENTBD SEPT. 8,1903. I R. T. SCHRAUBSTADTER.

CONGENTRATOR TABLE.

APPLICATION FILED JULY 5. 1901. N0 MODEL.

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iMQWmmmmmnummIINIHHIIIIIIIIIHMH Patented September 8, 1903.

UNITED STATES PATENT OFFICE.

`RICI-IARDLT. SCI-IRAUBSTADTER, OF ST. LOUIS, MISSOURI, ASSIGNOR TO FREDERIC W. RITTER, J R., WASHINGTON, DISTRICT OF COLUMBIA.

CONCENTRATOR-TABLE.

SPECIFICATION forming part of Letters Patent No. 738,493, dated September 8, 1903.

Application filed July 5, 1901. Serial No. 67,210. (No model.) L

To all whom, t may concern:

Be it known that I, RICHARD T. SCHRAUBT sTADTER, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented certain new and usefulA Improvements in Concentrator-'lables; and I hereby declare the following1 to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which- Figure l is a perspective view of a concentrator-table embodying my invention, the feed end being in the foreground. Figs. 2 and 3 are transverse sections thereof, taken on the lines 2 2 and 3 3, Fig. l. Fig. is a vertical section on the line 4 t, Fig. l, the riiiies omitted. Fig. 5 is a side elevation of the concentratortable, showing means for reciprocating the same.

Like symbols refer to like parts wherever they occur.

My invention relates generally to that class of ore-eencentrators wherein the matrix and values are separated by gravity and water, but more particularly to that class which is laterally inclined and to `which an endwise vibratory motion is imparted by suitable mechanism and with which a flow of water is employed to carry off the gangue or lighter material at the lower edge of the table, while the values are directed lengthwise of the table and delivered at the tail thereof. In this class of eoneentrators, as is well understood by those skilled in the art, the lateral inclination of the table determines the capacity as well as the range of sizes of the material ca* pable of treatment by the eoneentrator, the steeper the inclination the greater the capacity, the less the inclination the greater the saving of fine values. Concentrator-tables, therefore, as heretofore constructed may be said to have been of a compromise characterthat is to say, the table proper has been in the nature ol' a plane surface set at an inclination to obtain the desired capacity and having its surface broken at internals by riliies to check the liow of the water and intercept the values and direct the same to the tail of the table. To increase the range and efficiency of such coneentrators, the riffies have been variously arranged-as, for instance, diagonally, longitudinally of different lengths, in-

ble, utilize the greater part of its surface, ef-v feet a cleaner separation of values from the matrix, and to dispense with the previous use of jigs or screens.

To this end the main feature of my invention consists in a concentrator-table having a warped surface or approximation thereto,

whereby the lateral inclination or slope is rendered variable from head to tail or from the feed to the discharge end of the table and whereby an increased range of sizes of the Inaterial to be treated is rendered possible, and,

second, in avhorizontal arrangement of riffles with relation to said warped surface of the table, whereby said riffles being at right angles to the trajectory of the flow saving of the line values is insured.

There are other minor features of invention, all as will hereinafter more fully appear.

I will now proceed to describe my invention more fully, so that others skilled in the art to which it appertains may apply the same.

In the drawings, l indicates the surface of a concentrator-table embodying my invention, l"L the head, and lb the tail or discharge end for values.

The lateral edges 2 and 3 of the table lie in different planes and are not parallel, while the head and tail edges l and lb lie in the plane of the surface of the table and parallel to a common plane, which results in relatively elevating the corner (the feed-corner) with relation to the corner y (upper tail-corner) and giving to the surface 1 of the table the form of a hyperbolic paraboloid, which is the preferred form of my warped table.

t 4 indicate riflies which are applied to the table at intervals on lines formed by the intersection of horizontalplanes with the warped surface 1 of the table, which causes said ril'fles to assume the form of parabolas, with their curvatures substantially normal or at right ,angles to the direction of flow of the material operated upon, which effects a more perfect separation of the values from the matrix or gangue as well as adding to the durabilityor life of the table.

The surface of the table will preferablybe covered with linoleum, andthe rii'fles 4, which may be Vof wood or other suitable material, will, owing to the warp of the table, be made to taper toward the tail of the table and preferably terminate along a parabola. The table may also be mounted in any suitable manner and vibrated by any preferred mechanism-as, forinstance, the table may be supported or suspended by adjustable links or rest upon rollers d (see Fig. 5) and reciprocated by means of a power-driven cam-wheel A and a rod and returnespring h B, the former being changeable and the latter adjustable by means of the nut c or otherwise to vary 'the length and time ofthe movement of lthe table.

The operation of the table vis in general the same as tables of like class-that is to say, the table being given a longitudinal vibratory motion, preferably Witha quick forward and slow return movement, and a flow of water provided for, the material to be treated is fed on theV table at its upper corner, near the head, and is carried downward by the flow and moved toward the tail of the table by the vibratory motion thereof, so as to assume a more or less diagonal travel from the head to the tail of the table, extending for at least three-fourths of the length of the table. Dur ing the travel of the material diagonally across the table the direction of the flow will be at substantially right angles to the riffles, and the values will be deposited in the runs formed by the riffles and will move the v length of the table under the impulse of vibration, being discharged at the tail thereof, while the gangue will be carried down and over the lower lateral',` ge of the table for the greater part of it'` ,ngtlL The rifiies may terminate along aparabola, which is practicallya line of equal fall or grade. The lower edge of this parabola will be normal to the edge of the table. I'Ience the headings can be better removed or separated from the middlings which adj oin them as compared to plain surfaces, where the products proceed along an acute angle to the edge, as in prevous constructions. Owing to the paraboloid form of the table and the'parabolas formed While I have shown and described a hyper- I bolic paraboloid as the preferred surface, it will be evident that other warped surface may be employed without departing from the spirit of my invention, which includes, broadly, the utilization of a warped surface or approximations thereto for concentrator-tables either with or without riffles.

Vherever in the foregoing specification and the following claims the term warped surface is used the same is to be taken as meaning any surface which may be generated by a right line moving so that no two of its consecutive positions shall `be in the same plane.

Therefore, having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. A concentrator-table having a warped surface and means for reciprocating said table, substantially as and for the purposes specified.

2. Aconcentrator-table having a warped surface provided with riffles and means for reciprocating said table, substantially as and for the purposes specified. Aconcentrator-tablehavingawarped surface and provided with riffles arranged on lines formed by the intersection of horizontal planes with the warped surface of the table and means for reciprocating said table, substantially as and for the purposes specified.

4. A concentrator--table having a concentratingfsurface in the form of a hyperbolic paraboloid, and means for reciprocating said table, substantially as and for the purposes specified.

5. A concentrator-table having a concentrating-surface in the form of a hyperbolic paraboloid, provided with riffles which have the form of parabolas, and means for reciprocating said table,l substantially as and for the purposes specified.

In testimony whereof I affix my signature, in presence of two Witnesses, this lst day of July, 1901.

RICHARD T. SCHRAUBSTADTER.

NVitnesses:

JOSEPH H. ZUMBALEN, W. E. Fissa.

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Corrections in Letters Patent No. 738,493.

It is hereby certified that in Letters Patent N o. 738,493, granted September 8, 1903, upon the application of Richard T. Sehraubstadter, of St. Louis, Missouri, for an improvement in Concentrator-Tables, errors appear in the printed specification requiring correction, as follows: On page l, line 46, the Word internals should read intervals; same page, line 52, a comma should be inserted after the Word longitudinally, and the comma after the Word lengths should be stricken out. Page 2, line 50, the period after the Word table should be stricken out and a comma inserted, and the following Word Hence should begin With a small 11, thus maku ing a continuous sentence; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oice.

Signed and sealed this 27th day of October, A. D., 1903.

[sEAL] v F. I. ALLEN,

Commission er of Patents. 

